Final cut pro x has a very slick interface. It will make even the most amateur of video editors feel like they're in a pro suite.
Certain things like handles for dissolves, tranistions and fade are well thought out.
The addition of MXF editing has kept the software somewhat relevant in the editing ecosystem.
Background/Auto editing is an interesting feature.
While it might be slick, Final Cut Pro X takes steps back in almost every direction from 7. Not only that, but it fails to stay competitive in the professional video editing environment.
The file handling is uncecessarily complicated. It should be bin/folder based but instead forces iMovie-like events and date based folders. File encoding is also needlessly bloated and unclear.
Doing simple effects and custom workflows as nearly impossible as Final Cut X relies more on built in templates and preset effects rather than giving the editor power to create their own.
Probably the worst aspect is that files exported from Final Cut X can be glitchy and unreliable- to the point where as a broadcast station we have dissallowed exports from Final Cut X entirely.
I've had an entire timeline disappear before and had to restart - only to find out later it was a visual glitch and was fixable by erasing the preferences.